Results of mapping and stratigraphic research in the Rača Unit on the Horní Bečva Map Sheet

In the frame of geological mapping in scale 1:25 000, stratigraphy of the Rača Unit comprising the Rajnochovice, Kaumberg, Soláň, Beloveža and Zlín Formations was revised on the map sheet Horní Bečva. The Vigantice Klippe consisting of the Kurovice Limestone is newly interpreted as the nappe outlier of the Rača Nappe. Deep-water foraminifera dominated by agglutinated forms were extracted from limestone using the acetolysis. Known occurrences of Lower Cretaceous black flysch of the Rajnochovice Formation were revised and most of them reassigned to younger strata. The type area of the Soláň Formation was studied in detail for the first time. Several horizons of variegated shale were observed within the formation.In the frame of geological mapping in scale 1:25 000, stratigraphy of the Rača Unit comprising the Rajnochovice, Kaumberg, Soláň, Beloveža and Zlín Formations was revised on the map sheet Horní Bečva. The Vigantice Klippe consisting of the Kurovice Limestone is newly interpreted as the nappe outlier of the Rača Nappe. Deep-water foraminifera dominated by agglutinated forms were extracted from limestone using the acetolysis. Known occurrences of Lower Cretaceous black flysch of the Rajnochovice Formation were revised and most of them reassigned to younger strata. The type area of the Soláň Formation was studied in detail for the first time. Several horizons of variegated shale were observed within the formation

FORAMINIFEROVÁ FAUNA OXFORDSKÝCH VÁPENCŮ NA ŠVÉDSKÝCH ŠANCÍCH U BRNA

From the excavations near the classical Jurassic locality Švédské šance (Schwedenschanze) in Brno-Slatina, foraminifer fauna was extracted by dissolution of limestone in 80% acetic acid. 20 species of foraminifers were identified and some species are discussed. Representatives of genera Spirillina, Trocholina and Paalzowella highly dominate the taphocoenoses. The foraminifers indicate the Middle Oxfordian age

The ichnological record across the Cretaceous/Tertiary boundary in turbiditic sediments at Uzgruň (Moravia, Czech Republic)

The deep-sea, distal turbiditic deposits at Uzgruň have recorded no significant change of trace fossil diversityand ichnofabrics across the Cretaceous/Tertiary (K/T) boundary interval. There is no evidence of any ecological catas-trophe that can be related to the K/T event. The trace fossil association is rather poor in diversity. This can be related toa general oligotrophy and poor preservation potential. The producers of the discussed trace fossils, dominated by Chon-drites intricatus (Brongniart), Chondrites targionii (Brongniart), Ophiomorpha annulata (Książkiewicz), Ophiomorpharudis (Książkiewicz), Palaeophycus tubularis Hall, Planolites isp., Phycosiphon incertum Fischer-Ooster, Thalassinoidesisp. and Trichichnus isp. lived in a habitat, which had not been influenced by the event

Geological results of documentation of the R48 road construction between Rychaltice and Frýdek-Místek

Road constructions of the R48 Highway enabled field observations of bedrock units hidden in the area between Rychaltice and Frýdek-Místek beneath extensive Quaternary cover. In the Subsilesian Unit following formations/members were documented: 1. Frýdek Fm. (Maastrichtian–Lower Eocene), 2. Frýdlant Fm. – variegated clays (Middle Eocene), 3. Menilite Fm. – Šitbořice Mb. (Upper Kiscellian). Two formations of the Silesian Unit were identified: 1. Hradiště Fm. (Barremian?), 2. Chlebovice Beds (Cenomanian). In the olistostrome enclosed in the Chlebovice Beds, small olistolith of Oxfordian limestone was proven biostratigraphically (foraminifers) among the frequent blocks of the Štramberk-type limestone.Road constructions of the R48 Highway enabled field observations of bedrock units hidden in the area between Rychaltice and Frýdek-Místek beneath extensive Quaternary cover. In the Subsilesian Unit following formations/members were documented: 1. Frýdek Fm. (Maastrichtian–Lower Eocene), 2. Frýdlant Fm. – variegated clays (Middle Eocene), 3. Menilite Fm. – Šitbořice Mb. (Upper Kiscellian). Two formations of the Silesian Unit were identified: 1. Hradiště Fm. (Barremian?), 2. Chlebovice Beds (Cenomanian). In the olistostrome enclosed in the Chlebovice Beds, small olistolith of Oxfordian limestone was proven biostratigraphically (foraminifers) among the frequent blocks of the Štramberk-type limestone

Late Cretaceous fauna (Foraminifera, Bivalvia) of the Subsilesian Unit from Kopytná stream in Bystřice nad Olší

Recently, Late Cretaceous strata ranging from the Cenomanian to the late Maastrichtian were found in the Subsilesian Unit of Moravian Carpathians. The stratigraphic assignment is based upon planktonic and benthic foraminifer biostratigraphy. Planktonic foraminifer markers: Marginotruncana pseudolinneiana Pess., Globotruncanella petaloidea (Gand.), Laeviheterohelix dentata (Sten.), Rugoglobigerina pennyi (Brön.) and benthic foraminifer markers: Plectorecurvoides irregularis Geroch, Bulbobaculites problematicus (Neagu), Uvigerinammina jankoi Majzon, Conotrochammina sp. etc. are briefly discussed and figured. In Campanian–Maastrichtian marls also articulated specimens of inoceramid bivalves Platyceramus sp. indeterminable to specific level were found. They are related to giant inoceramids known from the Coniacian–Campanian of the Euramerican biogeographical region and North Pacific Province. Folded inoceramid valves evidences slumping of sediment during the early diagenesis, prior to formation of carbonate concretions that include the shells. Both lithology and composition of foraminifer assemblages show trend from eutrophic black clays of the Cenomanian, through greenish silty clays of the Turonian–Coniacian, towards greygreen mottled and more oligotrophic variegated marls and clays of the Campanian–Maastrichtian. Cenomanian taphocoenosis consists of agglutinated taxa dominated by Rhizammina, Hyperammina, Kalamopsis and Adercotryma. Calcareous benthic foraminifers are extremely rare, planktonics are missing. Benthic foraminifer density (specimens per 1 g of rock) is about 9. Turonian–Coniacian taphocoenosis contains, besides agglutinated taxa, also some calcareous taxa including few planktonics. Campanian–Maastrichtian taphocoenoses comprise agglutinated and calcareous benthics indicating bathyal habitat (Marssonella, Spiroplectammina, Recurvoides, Gyroidinoides). Benthic foraminifer density reaches the value 643. At the same time the planktonic foraminifers represent 94 % of taphocoenosis.Recently, Late Cretaceous strata ranging from the Cenomanian to the late Maastrichtian were found in the Subsilesian Unit of Moravian Carpathians. The stratigraphic assignment is based upon planktonic and benthic foraminifer biostratigraphy. Planktonic foraminifer markers: Marginotruncana pseudolinneiana Pess., Globotruncanella petaloidea (Gand.), Laeviheterohelix dentata (Sten.), Rugoglobigerina pennyi (Brön.) and benthic foraminifer markers: Plectorecurvoides irregularis Geroch, Bulbobaculites problematicus (Neagu), Uvigerinammina jankoi Majzon, Conotrochammina sp. etc. are briefly discussed and figured. In Campanian–Maastrichtian marls also articulated specimens of inoceramid bivalves Platyceramus sp. indeterminable to specific level were found. They are related to giant inoceramids known from the Coniacian–Campanian of the Euramerican biogeographical region and North Pacific Province. Folded inoceramid valves evidences slumping of sediment during the early diagenesis, prior to formation of carbonate concretions that include the shells. Both lithology and composition of foraminifer assemblages show trend from eutrophic black clays of the Cenomanian, through greenish silty clays of the Turonian–Coniacian, towards greygreen mottled and more oligotrophic variegated marls and clays of the Campanian–Maastrichtian. Cenomanian taphocoenosis consists of agglutinated taxa dominated by Rhizammina, Hyperammina, Kalamopsis and Adercotryma. Calcareous benthic foraminifers are extremely rare, planktonics are missing. Benthic foraminifer density (specimens per 1 g of rock) is about 9. Turonian–Coniacian taphocoenosis contains, besides agglutinated taxa, also some calcareous taxa including few planktonics. Campanian–Maastrichtian taphocoenoses comprise agglutinated and calcareous benthics indicating bathyal habitat (Marssonella, Spiroplectammina, Recurvoides, Gyroidinoides). Benthic foraminifer density reaches the value 643. At the same time the planktonic foraminifers represent 94 % of taphocoenosis

Results of micropalaeontological revision of Cf boreholes from Šaratice

Restudy of archive foraminifer slides from Šaratice boreholes and new field observations allowed revision of the geology in the margin of the Carpathian Flysch Belt southeast of Brno. In the marginal zone originally assigned to the Němčice Formation newly three different formations were distinguished: Pouzdřany Formation of the Pouzdřany Nappe, and Němčice and Menilite formations of the Ždánice Nappe. Planktonic foraminifers were applied in biostratigraphical assignment of samples. Benthic communities were statistically evaluated using cluster analysis. Each formation has distinct microfossil taphocoenosis and characteristic benthic foraminifer community. Microfossil communities with abundant sponge spicules and diatom valves preserved in opal and also presence of small mollusc fauna and fish otoliths indicate that marginal zone of Ždánice Nappe was deposited little bit shallower than the more internal zones. Also lithology reflects different palaeoenvironment. Clays of the Menilite Formation are macroscopically undistinguishable from Hustopeče-type clays of the overlying Ždánice-Hustopeče Formation. The Ždánice-type sandstones are practically missing. Grey pelocarbonate concretions are frequent in both Menilite and Ždánice-Hustopeče formations. The marker lithologies of the Menilite Formation – the menilite chert and Dynów-type marlstone (or their analogues) – were not observed yet. Results of the revision show that the marginal zone of the Carpathian Flysch Belt in Šaratice area comprises tectonic slices of mentioned formations, the number and order of whose change from borehole to borehole.Restudy of archive foraminifer slides from Šaratice boreholes and new field observations allowed revision of the geology in the margin of the Carpathian Flysch Belt southeast of Brno. In the marginal zone originally assigned to the Němčice Formation newly three different formations were distinguished: Pouzdřany Formation of the Pouzdřany Nappe, and Němčice and Menilite formations of the Ždánice Nappe. Planktonic foraminifers were applied in biostratigraphical assignment of samples. Benthic communities were statistically evaluated using cluster analysis. Each formation has distinct microfossil taphocoenosis and characteristic benthic foraminifer community. Microfossil communities with abundant sponge spicules and diatom valves preserved in opal and also presence of small mollusc fauna and fish otoliths indicate that marginal zone of Ždánice Nappe was deposited little bit shallower than the more internal zones. Also lithology reflects different palaeoenvironment. Clays of the Menilite Formation are macroscopically undistinguishable from Hustopeče-type clays of the overlying Ždánice-Hustopeče Formation. The Ždánice-type sandstones are practically missing. Grey pelocarbonate concretions are frequent in both Menilite and Ždánice-Hustopeče formations. The marker lithologies of the Menilite Formation – the menilite chert and Dynów-type marlstone (or their analogues) – were not observed yet. Results of the revision show that the marginal zone of the Carpathian Flysch Belt in Šaratice area comprises tectonic slices of mentioned formations, the number and order of whose change from borehole to borehole

NĚKTERÉ VÝZNAČNÉ I MÁLO ZNÁMÉ VÁPNITÉ BENTICKÉ FORAMINIFERY EOCÉNU Z VRTŮ MND NA JIŽNÍ MORAVĚ

Nineteen species of calcareous benthic foraminifers from the Eocene of the Ždánice Unit and southeastern slope of the Bohemian Massif are discussed and figured. The foraminifers came from the oil prospection and production boreholes from the vicinity of Slavkov, southern Moravia. Most of discussed species are new for the territory of the Czech Republic. The genera Abyssamina, Altasterella, Burseolina, Epistomaria and Pijpersia are reported from this territory for the first time

VÝSLEDKY MIKROPALEONTOLOGICKÉHO STUDIA VRTŮ VYHLOUBENÝCH V RÁMCI VÝZKUMU SESUVŮ V MAGURSKÉM FLYŠI

Continuously cored boreholes drilled in framework of landslide research in the Outer Flysch Carpathians were studied micropaleontologically. Biostratigraphic results of boreholes near Nedašov indicate tectonic slice of the Bystrica Unit behind the nappe front of the Bílé Karpaty Unit not recognized by geological mapping. Agglutinated foraminifera zones in the Malá Bystřice 2 Borehole allowed evidence the repetition of Eocene strata in landslide accumulation due tectonic or landslide movements. In the Soláň Formation of the Solánec 1 Borehole pyritized radiolarians of Maastrichtian age indicate formation of oxygen-minimum zone above the bottom waters during deposition

Phosphate and pelocarbonate from pelitic rocks of the Subsilesian Unit at the R48 road constructions near Frýdek-Místek, Czech Republic

Two samples of concretions from Maastrichtian and Paleocene grey clays/claystones of the Subsilesian Unit near Frýdek-Místek two samples of concretions were studied. The sample from the Paleocene/Eocene clays of the Frýdek Formation is phosphate nodule composed of highly prevailing amount of fluorapatite, low content of quartz and small amount of chlorite, muscovite and accessories. The phosphate nodules may be in fact coprolites. The sample from the Maastrichtian Frýdek Formation is sedimentary siderite (pelosiderite) with trace content of calcite.Two samples of concretions from Maastrichtian and Paleocene grey clays/claystones of the Subsilesian Unit near Frýdek-Místek two samples of concretions were studied. The sample from the Paleocene/Eocene clays of the Frýdek Formation is phosphate nodule composed of highly prevailing amount of fluorapatite, low content of quartz and small amount of chlorite, muscovite and accessories. The phosphate nodules may be in fact coprolites. The sample from the Maastrichtian Frýdek Formation is sedimentary siderite (pelosiderite) with trace content of calcite

Complex structure of a foundation soil of the International Clinical Research Center of St. Anne‘s University Hospital Brno

A preliminary geological investigation expected several meters of Neogene clays under a designed building of the ICRC complex (a new building at University Hospital in Brno). The foundation designer designed an eleven meters deep excavation works supported by Larsen sheet walls balanced/pulled by several horizontal layers of soil anchors. During the next stage of the geological investigation different geological conditions were encountered. The foundation design was completely re-worked and the excavation slopes were supported by a drilled reinforced concrete anchored pile-wall. The designed ICRC building has been founded partly on a hard bedrock and partly on the expected stiff soil.Several geological units were encountered especially during a geotechnical supervision of the foundation works and by laboratory tests. The bedrock consists of Neoproterozoic metabasalts of the ophiolite belt (Brno Massif) covered in places by Paleozoic clastics (Old Red facies). The bedrock is overlain by Neogene gravels and clays of the Carpathian Foredeep with angular unconformity. Reworked Cretaceous agglutinated foraminifera recovered from the clays are typical for the Lower Miocene (Ottnangian) stratain the area. The Quaternary cover of the area comprises fluvial sandy gravels and muds of Svratka river. The encountered tectonic structure composed by several directions of normal and strike-slip faults shows severe tectonical movements recorded during the Alpine orogenesis.A preliminary geological investigation expected several meters of Neogene clays under a designed building of the ICRC complex (a new building at University Hospital in Brno). The foundation designer designed an eleven meters deep excavation works supported by Larsen sheet walls balanced/pulled by several horizontal layers of soil anchors. During the next stage of the geological investigation different geological conditions were encountered. The foundation design was completely re-worked and the excavation slopes were supported by a drilled reinforced concrete anchored pile-wall. The designed ICRC building has been founded partly on a hard bedrock and partly on the expected stiff soil.Several geological units were encountered especially during a geotechnical supervision of the foundation works and by laboratory tests. The bedrock consists of Neoproterozoic metabasalts of the ophiolite belt (Brno Massif) covered in places by Paleozoic clastics (Old Red facies). The bedrock is overlain by Neogene gravels and clays of the Carpathian Foredeep with angular unconformity. Reworked Cretaceous agglutinated foraminifera recovered from the clays are typical for the Lower Miocene (Ottnangian) stratain the area. The Quaternary cover of the area comprises fluvial sandy gravels and muds of Svratka river. The encountered tectonic structure composed by several directions of normal and strike-slip faults shows severe tectonical movements recorded during the Alpine orogenesis